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Design Science Journal
Papers

Knee dynamic analysis in the development of above knee prosthesis for alpine skiing

Knee dynamic analysis in the development of above knee prosthesis for alpine skiing

Year: 2013

Editor: Udo Lindemann, Srinivasan V, Yong Se Kim, Sang Won Lee, John Clarkson, Gaetano Cascini

Author: Demšar, Ivan (1); Supej, Matej (2); Duhovnik, Jože (1)

Series: ICED

Institution: 1: University of Ljubljana, Faculty of Mechanical Engineering, Slovenia; 2: University of Ljubljana, Faculty of Sport, Slovenia

Pages: 089-098

ISBN: 978-1-904670-52-0

ISSN: 2220-4334

Abstract

The development of biomechanical systems requires detailed knowledge of a natural system. The work includes an analysis of the natural process of the kinematics and dynamics in the knee joint in a laboratory simulation of motion through a ski turn. Measurements and analyses of the results are the foundation for the development of the prosthetic knee for ordinary two-track skiing for above the knee amputees. A dedicated testing facility was built, allowing simultaneous capturing of leg structure kinematics and surface loading rates. Changing additional vertical loads in the waist area, different conditions of performing a ski turn were simulated.

Measuring the kinematics and dynamics of a control group of able-bodied skiers show that rotation in the knee joint is below 60°. Longitudinal force in the knee reaches values of up to 1.2 N/kg. Average vertical load in the knee exceeds 10 N/kg. The knee flexing/extension moment reaches values of over 1.5 Nm/kg. The presented laboratory measurements are comparable with those on ski slopes and represent the basis for the development of tailor-made prosthetic knees.

Keywords: New product development, simulation, above-knee amputation, alpine skiing, kinematics and dynamics analysis.

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Keywords
SIG Workshop - March 2013